#1 & #4 are fantastic! I really like #4. That's about as realistic as you can get. And the chrome lip on the wheels accents the entire shot perfectly. Very nicely done G!
Edit: #7 is really good to. You have to open that one up to see just how good it is. Except, you have this big-ole signature thing on all of them. It's a cool signature, but you are covering up the content of the shot! I just like to look at the shot without a distracting signature. Maybe make it smaller and opaque or something. Just a though.